A block is gently placed on a conveyor belt moving horizontally with constant speed. After t = 4s, the velocity of the block

Question

A block is gently placed on a conveyor belt moving horizontally with constant speed. After t = 4s, the velocity of the block becomes equal to the velocity of the belt. If the coefficient of friction between the block and the belt is = 0.2 then the velocity of the conveyor belt is

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